Johnson Controls YVAHP0721CW Series, Service Manual

Page: 280 / 416

3-116
SM-16007
TROUBLESHOOTING
3.4.3 Checking the Test Run
(1) Indoor and Outdoor Fan
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(2) Power Supply Voltage
Check the power supply.
If the power supply is abnormal, contact the electric
power company.
Usually, voltage drop will occur when starting the
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2
).
In order to protect the device, comply with the following
normal range of the power supply voltage.
<Normal Range of Power Supply Voltage>
• Supply Voltage: Rated Voltage < +10%
Operating Voltage (V
3
): Rated Voltage < +10%
• Starting Voltage (V
2
): Rated Voltage > -15% Voltage Imbalance between Phase: < 3%
(3) Normal Operating Pressure
Normal operating suction pressure is 29 to 159.5 psi (0.2 to 1.1 MPa) and normal operating discharge
pressure is 145 to 507.6 psi (1.0 to 3.5 MPa) when the refrigerant charge quantity is correct. Check
the operation pressure in the test run mode.
(4) High Pressure Switch
Check the operation pressure of the high pressure switch in the table below.
(b) When the high pressure retry control is activated, alarm code “ ” will be indicated on the
7-segment display of the outdoor unit PCB. If the high pressure retry control occurs three times or
more within 30 minutes, alarm code “
” will be indicated on the LCD of the wired controller or the
7-segment display of the outdoor unit PCB.
(5) High Pressure Increase Retry (Protection Control)
(a) High pressure will increase when the following procedure is performed.
Refrigerant Operation Pressure
R410A 601 psi (4.15MPa)
Initial Voltage
< Voltage Change >
(V
1
)
Starting Voltage
(V
2
)
Operating Voltage
(V
3
)
Cover the air inlet of outdoor unit
during cooling operation.
Cover the air inlet of indoor unit
during heating operation.
NOTE:
High pressure may not increase until the high pressure switch is activated because of the
temperature condition.
< For CIW01 >
Sel. OP MODE
I.U. : RCI-3.0FSN3
MODEL : F .02
Alarm Code:
45
O.U. : RAS-3HVRNM2
01-02
AlarmRst
Address
Entr
IDU :
******
ODU :
******
Chek
OK